Shutter-adjusting device



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LEONARD COMES EAGElTI-IABDT, F WESTERNPORT, MARYLAND.

SHUTTER-ADJSTNG DEVIECE.

To all whom t may concern:

Be it known that l, LEONARD Cones Pasan# namur, a citizen of the United States, and a resident of lVesternport, in the county of Allegany and State of Maryland, have made certain newA and useful Improvements in Shutter-Adjusting Devices, ofwhich the following is a specification. j

My invention relates to improvements in motion picture machines, it being more particularly an improvement for adjusting the revolving shutter, and it consists in the constructions, combinations and arrangements herein described and claimed. i

One of the foremost objects of the invention is to provide an improved shutter for motion picture machines, means being embodied for enabling certain adjustments of the shutter while in motion, thereby eliminating or overcomingl a commonly lrnow'n defect in the projected pictures on the screen, called travel ghost, without interfering with the operation of the motion picture machine. A further obj provide a simple shutter adjusting .device for motion picture machines, which is easily applied and does not require any modification of the existing motion picture machine 'mounting frame, and

Fig. 6 is a detail perspective view of the feed worm pinion. A

Thel motion picture machine, improved vice is applied, is partly shown in Fig. l. That is to say, only so much of the, machine is shown as is necesssary to illustrate the application of the invention.

The shutter shaft bracket 1 is carried by to which the Specication of Letters Patent in the mechanism ect of the invention is toV a perspective view showing.

4 is a detail perspective view of a` takes place,I

feed sleeve 8 'at revolving shutter adjusting de` the frame or housing 2 'of the motion picture machine in a manner well known by those experienced in this art. This bracket includes bearing portions 3 in which the shutter shaft L is journaled. The shaft carries a worm 5 which is driven by a worm gear forming a part of the machine, but not illustrated in the drawing.

The revolving shutter 6 in its chief aspect is the same as any shutter of this type now in use. The present shutter has two win s, one of which is the cutoif wing orvbla e, the `other the flicker blade. The shutter is rapidly revolved by the shutter shaft Il in front `of the lens 7,v and it is the purpose of the present invention to provide a forward or backward adjustment of the revolving shutter in the plane of rotation. rll`his adjustment is effected while the shutter is in motion, and by enabling such adjustment of the shutter, ghost commonly seen, particularly in the printed titles of picturesl and appearing as a dim 4white trail, either above or below the letters, is capable of elimination.

rfhe adjusting device vcomprises a feed sleeve S, which is longitudinally slidable on the extremity-ofi the shutter shaft il, and has a stud 9 in engagement with the lreyn ,way 10 ofthe shaft f1, loymeans of which arrangement, the sliding function is permitted, but relative turning of the sleeve is prevented. This feed sleeve has a plurality of spiral grooves 11.

Theseare 'occupiedby 'the spiral 'teeth 12 formedin .a sleeve 12a fixed in the bore of the hub 18 ofthe revolving shutter@ by mea-ns of screws 12b. The purpose of the sleeve 12a is toenable a ner adjustment by means of Ithe' knurled screwv described below. rlhe sleeve 12a makes it possible to set the shutter nearer right in assembling the parts in the first place. rlhe shaft 4l, feed sleeve 8, and revolving shutter 6, all turn as one Patented dan; gli?, 1925i).

Application led August 13, 1919. Serialv No. 317,219.

the defect lknown as ,travel.\

ioo

integral part, no relative movement of the l shutter with respect to the feed sleeve 8, taking place until the adjusting function This is described below.. integrally mounted on or carried by the the rear en d, is the feed collar 14 which has a` groove 15 for the reception of the yolre 16. The yoke 16 is carried by the feed"` screw 17 which passes through the smooth bores of the integral bosses 18 of the mounting frame 19.

A chamber 20 is provided Ain the mounting frame 19 inthevicinity of the bosses 18, as

clearly shown in vFigs. 2 and 5, for the ac.

. chamber 20, and when the pinion is turned is again briefly reviewed here.

by means of the worm gear 23 on the .end of the stem 24, the feed screw 17 is'made4 to move either forwardly or `baokwardly,` according to the direction of turning of the knurled head 25, thereby' sliding the feed sleeve S in a corresponding direction. I The reader will understand at once that, regard ing the revolving shutter 6 as .being practr cally stationary with respect to the shaft L1, the sliding motion of the sleeve 8 will cause a forward or backward adjustment of the shutter in the direction-of rotation, by virtue of the spiral groove and teeth connections ii, i2.

Brackets 26, forming. parts of the mounting frame 19, provide bearings for the stem 2d and abutment between which the worm gear 23.is located. 1t can be plainly seen in F ig. 2 that the feed 4worin pinion 21 is i accessible by the gear 23 through an opening 27 in front of the frame 19 and communicating with the -chamber 20. l i

1n mounting the adjusting device the inclosed rectangular portion of the frame 19 is slipped over the square end of the shaft' bracket 1, and the frame is secured in place by means of the clamp screw 28.' AThe hub 13 of the revolving shutter 6 is threaded on the feed sleeve 8 where it'is kept in position and from again threading off, by means of the spider 29 at the front.

`For the purposes of accommodatingthe spider, the hub 13 is made with an annular groove 30 into which the ends of the arms of the spider 29 extend. The spider in turn is firmly secured on the extremity of the shutter shaft 4,1by means of the screw 31. The spider 29 keeps the revolving shutter in one position in respect to the shaft l. rlhat is to say, the revolving shutter 6 is free to turn, but the'spider keeps it from moving longitudinally of the shaft.

lThe operatiomalthough described above, llt has just been madeplain how the spider 29 keeps the revolving shutter 6 from'` moving lengthwise of the shutter shaft d but still permits free turning of the shutter. But it is not until the shutter adjusting mechanism comes into operation that there is any relative turning of the shutter in respect to the spider.v Assume now that it is desired to advance or retard the revolving shutter in the direction of its rotation.

'1he operator turns the stem 2d by means of the knurled head 25, whereupon the gears 23, 21 areturned and consequently the feed screw 1? is advancedy or moved back. The

ineens@ feed sleeve 8 mnstyadvance or inove hack l accordingly, and since the feed sleeve is prevented from turning on the shaft l by means of the stud and key groove connections 9, 10,

ment of the teeth 12, The adjustment of the' revolving shutter by means of the knuiled .A

head 25, -is lveryne and the operator is enabled to accurately adjust the shutter so as to eliminate the travel ghost alluded to above, and so often experienced in motion picture projection,

lllfhile the construction fand arrangement of the improved shutter adjusting inschanism, as herein described and claimed, is that of a generally` preferred form, obviously modifications and changes can be made without departing from the spirit of the inven- 1. 1n combinationt with a revolving shut# ter shaft vand a shutter carried and reyolved thereby; meanson the shaft by which .the

shutteris carried and by which adjustments of the shutter in the plane" of rotation are effected, means for moving said carrying means along the axis of the shaft and thereby effecting said shutteradjustments, and means carried by the shaft in engagement with a portion of the shutter for preventing axial movement of the shutter.

2. 1n combination with a revolving shutter shaft and shutter revolved thereby; means on the shaft by which the shutter is carried and with.f which it has spiral connection, means for moving said carrying means axially of the shaft thereby 'adjusting the shutter relatively tothe 'shaft in the plane of rotation, and means carried by the shaft in engagement with avportion of the shutter for preventing atrial movement of the shutter.v

3. 1n combination with a revolving 'shut-' ter shaft and shutter; means mounted to slide but not rotate on the shaft by which the shutter is carried, including spiral connections with the hub of the shutter; stationary ymounting means, instrumentalities operatively associated .with both the mounting and carrying means whereby the latter is axially `slid on the' shaft to effect adjustifient of the shutter in the plane of rotation by virtue ofthe spiral connection, and means engaging a portion of the shutter hub to prevent axial movement of the shutter.

d. 1n combination with a rotating shutter shaft and shatter; a non-rotatably but axially movable sleeve on the shaft with spiral grooves, means relatively stationary in respect to the shaft but operatively associated withthe sleeve toslide the same and adjust the shutter in .the plane of roios tation, the shutter having a hub arranged to receive the spiral groove; and means carried by the shaft in engagement with the hub preventing endwise movement of the shutter but permitting said shutter adjustments.

5. The combination, of a revolving member, an axially stationed shutter revoluble therewith, and a'member movable between the revoluble member and shutter, with inter-associated means to cause relative circular adjustn'ient of the 'shutter by such movement.

6. Means for mounting shutter adjusting mechanism on a bracket, comprising a frame with a rectangular portion having means for securing it in place on the bracket, and including a chambered portion with adjacent lugs having smooth bores, respectively for housing a feed worm pinion and receiving a feed screw.

7 Motion picture machine shutter adjusting means, comprising a shutter hub with spiral teeth, a feed sleeve with spiral grooves to receive the teeth, non-rotatably but axially slidably .applicable to a. revolving shutter shaft; means including a spider for preventing endwise. movement of .the hub and shutter in respect to the sleeve and shaft, a chambered and bracketed mounting frame with clamping means for fiXedly applying the frame to the shut-ter brackets,

including bosses with smooth bores adjacent the chambered portion; a feed screw passing through the bosses with means for operatively engaging t-he feed sleeve, a feed worm pinion in the mounting frame cham-- ber with a .threaded bore to receive the screw, and an actuating and engaging worm gearon a stem journaled in said bracket.,

8. Motionpicture machine shutter adjusting means, comprising a shutter hub, a sleeve with spiral teeth occupying a. bore in; the hub, and means for adjustably retaining the sleeve in the bore. e i

9. The combination in shutter adjusting means, of a revolving member, a non-,axially movable shutter revoluble with lsaid member, and a sleeve axiallyb movable between thev shaft and shutter, with cam groove and lug .connections to cause relative circular shutter adjustment by such movement.

10. The combination in shutter adjusting means, of a revolving member, a shutter, turning with said member, with membercarried means preventing axial movement; and a sleeve axially s lidable between the shaft and shutter, with mutually associated means for circularly adjustingthe shutter during such sliding.

11. In combination with a revolving shutter shaft, a relatively non-rotatable spirally grooved sleeve on the shaft; a shutter supported on Athe sleeve with a tooth in the groove, means to slide the sleeve axially and by said groove and tooth to adjust thc shutter circularly and means adj ustably fixed on the shaft to hold the shutter from axial movement but permit such circular adjustment.

LEONARD CONBS PAGENHARDT. 

